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BASELINE ASSESSMENT REPORT Site Number 11192 1403 Country Club Boulevard Stockton, California 1 . Site Features and History The site is an operating service station located on the northwest corner of the intersection of Pershing Avenue and Country Club Boulevard, Stockton, California. Site features include a station building, a car wash, an auto quick lube building with two service bays, an auto repair building with four service bays and three hoists, and six pump islands (three on both the north and south sides of the station building) with a concrete drive slab and canopy. Existing USTs at the station consist of three, double wall, fiberglass 10,000-gallon tanks installed in 1991 (CRWQCB, 1992). According to the station . manager, these USTs contain regular unleaded, super unleaded, and plus unleaded gasoline and are equipped with an electronic leak monitoring system. A 2,500-gallon waste oil UST is also located on the site between the two auto service buildings. The waste oil UST was also installed in 1991 (CRWQCB, 1992). A remote fill spout for this waste oil UST is located in each service bay of the quick lube building. EMCON visited the site on July 11, 1994. Two UST complex observation wells were noted at the northeast and southwest corners of the UST complex during the EMCON site visit. Neither well could be measured because each was secured with stripped allen screws. The fuel dispensers are equipped with spill contaminant boxes. The concrete drive slab and asphalt surfaces are in good condition. A sump that is periodically pumped out was noted in the floor of the southern service bay in the quick lube building. EMCON could not determine if an oil/water separator was located in the floor of the car wash building. EMCON noted fifteen 55-gallon drums located behind the car wash, quick lube, and auto repair buildings. Four of the drums were empty, while others contained used oil filters, grease, oily plastic sheeting, oily sludge, soil, and car wash wax. Four drums contained unknown liquids. BP acquired the station from Mobil in May of 1989 (BP, 1989). Three 10,000-gallon and four 2,000-gallon steel USTs, which had been installed in 1976, were removed in 1991 (International Technology Corporation [IT], 1991a). The site is located in .a . primarily residential area, although a bank is located east, across Pershing Avenue, and a pet store is located south of the site, across Country Club Boulevard. BfroS/RPr/11192RPr.d07-94/LAM/16:5 Rev.0, 12/27/94 0952-090.03 1